I have two guitars where the high e string sounds choked (strange timber, low sustain) open or fretted. With the way it sounds I would always assume the nut is the problem but given that the problem persists when the string is fretted the nut seems like an unlikely culprit. Other than the saddle potentially being the issue, what else could it be? For one of the two guitars, raising the action at the bridge didnt resolve the issue. Relief is reasonable on both. Thanks!